Sol-gel synthesis of long-lasting phosphors CdSiO₃: Mn²⁺, RE³⁺ (RE = Tb, Eu, Nd) and luminescence mechanism research

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• 作者：Xiaofei Qu ; Lixin Cao ; ^{caolixin@mail.ouc.edu.cn} ; Wei Liu ; Ge Su ; Pingping Wang ; Isabel Schultz
• 关键词：A. Inorganic compounds ; B. Sol&ndash ; gel chemistry ; D. Defects ; D. Luminescence
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：June, 2012
• 卷：47
• 期：6
• 页码：1598-1603
• 文件大小：695 K

摘要

Mn²⁺ and RE³⁺ (RE = Tb, Eu, Nd) co-doped CdSiO₃ orange phosphors were prepared at 1050 掳C by a sol-gel method. The phase and crystallinity of the synthesized materials were investigated by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The luminescence characteristics were analyzed using photoluminescence (PL) spectra, afterglow decay curves, long-lasting phosphorescence spectra, and thermoluminescence (TL) spectra. Due to the difference in co-doped rare earth ionic radii, it varied greatly in trap density and trap depth caused by the different defects deriving from RE³⁺ ions co-doping into the CdSiO₃: Mn²⁺ host. The afterglow intensity and time for these samples increased as follows: CdSiO₃: Mn²⁺0.2%, Nd³⁺0.8% < CdSiO₃: Mn²⁺0.4%, Tb³⁺0.8% < CdSiO₃: Mn²⁺0.4%, Eu³⁺0.3%. CdSiO₃: Mn²⁺0.4%, Eu³⁺0.3%had the best afterglow properties, which could be due to the proper traps formed by Eu³⁺ ions co-doping into the host. The role of RE³⁺ co-doped into the CdSiO₃: Mn²⁺ matrix and the possible long-lasting phosphorescence process was also discussed in this paper.